INTRODUCTION. 
T he following Forest Record is the third dealing with the experi- 
ments carried out in connection with the Antiseptic Treat- 
ment of Sleepers ; Volume III, Part II, dealt with laboratory experi- 
ments carried out in 1910; Volume VI, Part IV, dealt with the field 
experiments and recorded the state of the sleepers laid in the lines up 
to 1917. The oldest field experiments having been in progress nine 
and a half years, this Record — 
(i) deals with the present condition of the sleeper market ; 
{ii) records the state to date of the different species of sleepers 
treated by four processes ; 
(m) discusses the results obtained, and 
{iv) briefly reviews the conclusions arrived at from these experi- 
ments. 
The writer’s best thanks are due to all Railway Officers who have 
most carefully looked after the experimental sleepers laid in the different 
lines and for their unfailing assistance when carrying out the annual 
inspections. 
B 
